Open source auth projects
Every project in the registry tagged auth, ranked by real GitHub adoption.
Postgres-powered backend platform for production apps
Apache Casbin: an authorization library that supports access control models like ACL, RBAC, ABAC.
An open-source Agent-first Identity and Access Management (IAM) /LLM MCP & agent gateway and auth server with web UI supporting OpenClaw, MCP, OAuth, OIDC, SAML
Modern data layer for TypeScript apps - type-safe ORM, built-in access control, automatic query services
🔐 Authentication, Authorization, and Accounting (AAA) App and Plugin for Caddy v2. 💎 Implements Form-Based, Basic, Local, LDAP, OpenID Connect, OAuth 2.0 (Git
Related tags
Frequently asked questions
How many open source auth projects are there?
This registry tracks 5 projects tagged auth, with 154,893 GitHub stars between them. The most-adopted is Supabase at 114,446 stars.
Are these auth projects free to use?
Yes — 5 of the 5 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which auth project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these auth projects still maintained?
5 of the 5 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.